Masha completes a journey in three stages.

In stage 1 of his journey, she drives at an

average speed of 30km/h for 45 minutes.

๐๐ผHow far does Masha travel in stage 1 of her

journey?

In stage 2 of her journey, Masha drives at

an average speed of 50km/h for 2 hours 48 minutes.

Altogether, over all three stages, Masha drives 200 km in 4 hours.

๐๐ผWhat is her average speed, in km/h, in stage 3 of her journey?

๐๐ผ Simplify

๐๐ผ The force, F, between two magnets is inversely proportional to the square of the distance, d, between them.

When F = 4, d = 3.

Express F in terms of d.

๐๐ผ Without a calculator, estimate the value of